Pope Gregory I, commonly known as Saint Gregory the Great, was the 64th Bishop of Rome from 3 September 590 until his death on 12 March 604. 540 – March 15, 604; died at about 64. Alive at the same time as Umar ibn Al-Khattāb, Aryabhata, Pseudo-Dionysius the Areopagite, Muhammad, and Abu Bakr. Wiki link